Flight number record

AS 1421

Alaska Airlines · Houston to Portland

Route: IAH → PDX
Departs: 17:50
Flights: 352
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s AS 1421, check with Alaska Airlines.

AS 1421 lands a B, about a point better than the national rate of 77.6%. About one flight in five arrives 15 minutes late or worse, and those flights are late by about an hour on average. That is a workable record, not a spotless one. That rests on 352 flights, with a median arrival 5 minutes early.

On time

78.7%

Arrivals under 15 minutes late, of 347 completed flights

Avg delay

63 min

Across delayed arrivals only, not all flights

Cancelled

1.14%

National rate is 1.81%

1 hour+ late

5.5%

National rate is 8.1%

These figures cover 352 flights between July 2025 and June 2026. The median arrival is 5 minutes early, which is the part an average hides: most flights here are fine, and the on-time rate is decided by a tail of badly late ones. On-time means under 15 minutes late, the DOT's own threshold.

Schedule

When AS 1421 flies

AS 1421 flies IAH to PDX without a single fixed slot. Its most common scheduled departure was 17:50, used on 50 of 352 flights, with 17:55 (47 flights) and 17:57 (47 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 17:5050 flights14.2%
Departs 17:5547 flights13.4%
Departs 17:5747 flights13.4%

Scale runs 0% to 100%. Rows with fewer than 30 flights show a dash.

Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.

A 17:50 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.2%, and AS 1421 runs 11 points better at 78.7%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.

Against the route

AS 1421 next to IAH to PDX

Every carrier on IAH to PDX combined arrived on time 81.1% of the time across 1,233 flights, so AS 1421 is 2 points behind it. Across its whole network Alaska Airlines managed 79.1%, close to this flight's figure.

AS 1421 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
AS 1421thin sample	352	78.7%	63 min	1.14%	B
All Alaska Airlines on IAH–PDXthin sample	353	78.7%	63 min	1.13%	B
All carriers on IAH–PDX	1,233	81.1%	67 min	0.73%	B+
Alaska Airlines, whole network	293,372	79.1%	52 min	1.28%	B

Across the year

AS 1421 quarter by quarter

AS 1421 did not run the same all year. Its best quarter was Jul–Sep 2025 at 84.6% on time and its weakest Jan–Mar 2026 at 71.8%, a swing of 13 points on roughly 88 flights a quarter. The twelve-month rate averages over that, so if you are flying in a weak quarter the quarter's own figure is the better guide.

Jul–Sep 202592 flights84.6%
Oct–Dec 202590 flights79.5%
Jan–Mar 202679 flights71.8%
Apr–Jun 202691 flights77.8%

Scale runs 65% to 90%. Rows with fewer than 30 flights show a dash.

By weekday, AS 1421 ranged from 74.5% on Sunday to 82.7% on Monday. With about 50 flights behind each day, a spread of 8 points is inside normal variation, so the day you fly is not worth changing for this flight.

Delay causes

Why AS 1421 runs late

One category carries most of the weight here. Late-arriving aircraft accounts for 55% of the 4,669 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.

Late-arriving aircraft
55%
National Airspace System
20%
Carrier
14%
Extreme weather
9%
Security
2%

55% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 4,669 reported delay minutes here, that single category outweighs weather by 6 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 4,669 delay minutes reported on AS 1421.

Cancellations sit at 1.14% against a national 1.81%, which is ordinary. Diversions add another 0.28%.

Connections and routes

What a delay on this flight costs

5.5% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last about an hour, which a normal layover absorbs.

At 1,825 miles this is transcontinental flying, and long routes get a quiet structural advantage. Scheduled block time on a flight this length carries more padding in absolute minutes, so a twenty-minute late departure often still becomes an on-time arrival. Read the on-time rate here as slightly flattering next to a short-haul route with the same operational quality.

Every one of the 352 flights under AS 1421 in the data flew IAH to PDX. The number was not reused on any other city pair, which makes this a clean record of one route.

One caution: this is a thin sample. 352 flights over twelve months is enough to clear this site's floor but not enough to pin the rate down tightly, and a single bad week moves it by more than a point. Treat the grade as a rough reading.

What to do with this

Booking AS 1421

For a booking, read AS 1421 as 78.7% on time with 1.14% cancelled over 352 flights. Those are rates from the past twelve months, not a forecast for any particular day.

Where to go next

A flight number here means Alaska Airlines’s own number as it reports to the DOT. How the figures are computed is on the methodology page.

Source: US DOT Bureau of Transportation Statistics, on-time performance data, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.

Key figures